Marins all-new Alpine Trail E Bosch electric mountain bike use Boschs full-power Performance Line CX motor and run a mixed wheel (29in front, 27.5in rear) setup as stock.Like its non-electric counterpart, the Series Four aluminium frame is all-new, with travel boosted up to 160mm compared to the previous generation Shimano-powered Alpine Trail.Moving from Marins standard MultiTrac 2 linkage-driven single pivot suspension to the LT version, it now uses a Horst-link design.The Bosch integrated top tube display looks tidy. - Marin BikesFlip chips adjust bottom bracket height and chainstay length, while headset cups adjust the head angle between 62.4 degree and 64 degrees.At launch two models are available the Alpine Trail E2 and E1. The top-spec E2 retails for 6,385 / $6,599 / 7,249 / CAN$8,799 and the more affordable E1 costs 5,515 / $5,699 / 6,299 / CAN$7,599.Head to our full review of the new Marine Alpine Trail E2 to hear how the bike performs on the trails2024 Marin Alpine Trail E Bosch frame, suspension, motor and batteryThis 160mm travel bike is ready for gravity-fuelled rides. - Andy Lloyd / Marin BikesThe Alpine Trail E Bosch uses Marins Series 4 aluminium with a chunky straight downtube and more svelte top tube and seat- and chainstays.Cables enter via rubber ports on the downtube, which are held in place using a small hex bolt. The ports membrane is punctured to allow the cable to pass through. This forms a tight seal around the cable to reduce rattle and improve weatherproofing, according to Marin.The seat tube diameter is up from 30.99mm to 34.9mm. This is claimed to boost frame strength.Theres plenty of chain slap protection. This is made from a fibreglass-infused nylon.The bike now uses SRAMs UDH standard, so the bike is SRAM Transmission groupset compatible.There's plenty of chain slap protection. - Andy Lloyd / Marin BikesUnderside protection is also fitted. This clips and bolts in place, and needs to be removed to access the bikes battery. Drain ports let any moisture escape the frames tubes.Headset cups are used to adjust the bike's head angle. - Andy Lloyd / Marin BikesAngle-adjusting headset cups are also included as standard. The upper cup offsets the forks steerer tube at an angle relative to the head tube to adjust the bikes head angle.To make the head angle slacker, the cup offsets the forks steerer to the rear of the headtube, and to make it steeper it does the opposite, offsetting it to the front of the headtube.The lower cup uses a nylon doughnut to accommodate the angle of the tube; when the headset is tightened the doughnut lets the bearing angle within the metal cup, mirroring the position of the upper headset cup.Suspension designThe frame is made from aluminium. - Andy Lloyd / Marin BikesMoving to the brands all-new MultiTrac 2 LT design sees a shift from the linkage-driven single pivot design to a Horst-link system. This comes with a corresponding increase in travel from 150mm to 160mm.According to Marin, moving the pivot from the seatstay to the chainstay provided designers more freedom to reduce anti-rise to improve suspension performance while braking. It also increases mid-stroke support and bottom-out resistance.Additionally, the new design helped Marin implement its adjustable chainstay flip chips.Motor and batteryBosch's Performance Line CX motor is fitted. - Andy Lloyd / Marin BikesFitted with Boschs 85Nm Performance Line CX motor, this offers up to 340 per cent assistance.The inbuilt top tube controller has Boschs usual ten-stage battery and colour-coded mode indicators. Its paired with the wireless Mini Remote, fitted to the handlebars.A 750Wh Powertube battery is fitted within the bike's downtube. - Andy Lloyd / Marin BikesA 750Wh Powertube battery powers the motor. This slides into the bikes full-circumference downtube via a port at the bottom bracket. The rail system used on a lot of Bosch bikes uses a single clip to keep the battery in place.2024 Marin Alpine Trail E Bosch geometryIt's got progressive, adjustable geometry. - Andy Lloyd / Marin BikesThe 2024 Alpine Trail E Boschs geometry can be adjusted depending on rider needs and trail types.The head angle can be adjusted from its standard 63 degree position 0.75 degree in either direction.Flip chips adjust the bottom bracket height and chainstay length. - Andy Lloyd / Marin BikesThe chainstay flip chip adjusts chainstay length (CS) and bottom bracket (BB) height.High: BB 352mm, CS435mmLow: BB 347mm, CS 443mmAlthough the two adjustments work independently, the chainstay adjustment affects the head angle. In its slackest, longest and lowest setting the bikes head angle is 62.4 degrees.A chunky head tube permits angle adjustment. - Andy Lloyd / Marin BikesElsewhere figures are standard for an aggressive gravity-focussed electric mountain bike. However, a three size-range (medium to extra-large) may limit smaller riders from swinging a leg over the Alpine Trail E Bosch.Reach figures span from 454mm (medium) and 485mm (large) up to 515mm (extra-large).Seat tube angles are functionally steep, hovering around 78 degrees regardless of the bikes geometry settings.Elsewhere, stack heights start at 637mm, lift to 464mm and then settle at 650mm on the XL bikes.Together the figures look cohesive and progressive, and the adjustability is welcome addition so people can adjust their bikes according to their own needs. MLXL Seat tube angle (degrees)78.478.378.2 Head tube angle (degrees)636363 Chainstay (mm)443443443 Top tube (mm)594.92627.59660.36 Head tube (mm)115125130 Bottom bracket height (mm)345345345 Wheelbase (mm)1255.661290.121322.36 Standover (mm)706.29715.1726.28 Stack (mm)637.22646.31650.92 Reach (mm)454.84484.91515 Edit Table 2024 Marin Alpine Trail E Bosch models, prices and specificationsThe underside cover can be removed to access the battery. - Andy Lloyd / Marin BikesTwo models debut in the new Alpune Trail E Bosch range.The more expensive 6,385 / $6,599 / 7,249 / CAN$8,799 Alpine Trail E2 Bosch is fitted with Foxs Performance Elite 38 fork and DHX2 coil-sprung shock.Elsewhere, theres a Shimano SLX/XT 12-speed drivetrain mix and TRPs DH-R EVO brakes with 203mm rotors front and rear.Bosch's Wireless Mini Remote is used to change between modes. - Andy Lloyd / Marin BikesMarin-branded wheels are clad in Vee Tire Cos Attack HPL rubber, also fitted with CushCore inserts from the factory.At 5,515 / $5,699 / 6,299 / CAN$7,599 the E1 is more affordable. Up front is a Marzocchi Z1 fork and CR coil shock.Shimanos CUES 6000 10-speed drivetrain is fitted, along with TRPs Slate EVO brakes. Vee Tire Attack HPL tyres are still fitted, along with CushCore inserts.2024 Marin Alpine Trail E2 BoschMarin Alpine Trail E2 Bosch - Andy Lloyd / Marin BikesFrame: Series 4 Aluminium, MultiTrac 2 LT 160mm suspensionMotor and battery: Bosch Performance Line CX and 750Wh PowertubeShock: Fox DHX2 Performance EliteFork: Fox 38 Performance EliteDrivetrain: Shimano SLX/XT mixBrakes: TRP DH-R EVOWheels: Marin wheelsTyres: Vee Tire Co Attack HPL tyres and CushCore insertsPrice: 6,385 / $6,599 / 7,249 / CAN$8,7992024 Marin Alpine Trail E1 BoschMarin Alpine Trail E1 Bosch. - Andy Lloyd / Marin BikesFrame: Series 4 Aluminium, MultiTrac 2 LT 160mm suspensionMotor and battery: Bosch Performance Line CX and 750Wh PowertubeShock: Marzocchi CR CoilFork: Marzocchi Z1Drivetrain: Shimano CUES 6000Brakes: TRP Slate EVOWheels: Marin wheelsTyres: Vee Tire Co Attack HPL tyres and CushCore insertsPrice: 5,515 / $5,699 / 6,299 / CAN$7,599